rustc: Use --extern to always override #21782
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Previously if --extern was specified it would not override crates in the standard distribution, leading to issues like rust-lang#21771. This commit alters the behavior such that if --extern is passed then it will always override any other choice of crates and no previous match will be used (unless it is the same path as --extern). Closes rust-lang#21771
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Previously if --extern was specified it would not override crates in the standard distribution, leading to issues like rust-lang#21771. This commit alters the behavior such that if --extern is passed then it will always override any other choice of crates and no previous match will be used (unless it is the same path as --extern). Closes rust-lang#21771
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Previously if --extern was specified it would not override crates in the
standard distribution, leading to issues like #21771. This commit alters the
behavior such that if --extern is passed then it will always override any other
choice of crates and no previous match will be used (unless it is the same path
as --extern).
Closes #21771